Unconditional Delivery Listeners

The where clause argument in the addUpdateListener method is optional. When it is not provided, the real-time database will deliver any object  which is being updated in the database's table:

Using DictionaryCustom Class

var orderEventHandler = Backendless.Data.Of( "Order" ).RT();

orderEventHandler.AddUpdateListener( updatedOrder =>
{
  Console.WriteLine( $"an Order object has been updated in the database. Object ID - {updatedOrder[ "objectId" ]}" );
} );

var orderEventHandler = Backendless.Data.Of<Order>().RT();

orderEventHandler.AddUpdateListener( updatedOrder =>
{
  Console.WriteLine( $"an Order object has been updated in the database. Object ID - {updatedOrder.ObjectId}");
} );